Flat iron



FIG. 1 is a top and front perspective view of a flat iron, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a perspective view of the flat iron shown in a position of use coupled with an electric cord.

The broken lines in FIG. 8 are shown for the purpose of illustrating parts of the electric cord that form no part of the claim. 

CLAIM I claim, the ornamental design for a flat iron, as shown and described. 